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I just saw a video where a guy proposed a 20-mile-high tower. He said it was do-able with just steel. He claimed it would increase payloads by some big %. (I forget the exact number. Something like 50%. Or maybe it was 2x. [Big difference!] Sorry, I can't find it again.)

My point is, what could we build NOW to decrease cost of putting stuff into orbit? Is there any call for it? How many satellites do we need?